Evaluation of the bulk and alpha-case layer properties in Ti-6Al-4V at micro- and nano-metric length scale
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In the present study the hardness of individual alpha ( )-Ti grains in Ti-6Al-4V was measured by nanoindentation using Berkovich tip indenter. Additionally, alpha-case layer was induced by performing isothermal heat treatment at 700 °C in air for 500 hours. The average hardness of the -Ti grains found in the bulk material and in the alpha-case layer were 6.7 ± 0.7 GPa and 9.4 ± 1.4 GPa, respectively. The high hardness of the -Ti grains in the alpha-case layer is due to solid solution strengthening caused by interstitial oxygen diffusion. The thickness of the developed alpha-case layer was estimated metallographically and compared with that measured from a hardness profile performed along the layer. Moreover, electron back-scattered diffraction was used to determine the local crystallographic orientation, the texture of the alloy microstructure, as well as phase fraction changes, where the nanoindentation measurements were performed.
CitationSefer, B., Roa, J.J., Mateo, A., PEDERSON, R., Antti, M. Evaluation of the bulk and alpha-case layer properties in Ti-6Al-4V at micro- and nano-metric length scale. A: "Proceedings of the 13th World Conference on Titanium". WILEY, 2016, p. 1619-1624.
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